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Glossary
Lake Retreat
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Retreat
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Welcome
Wilderness
Yellow
Watershed Area
960 acres
Lake surface area
51 acres
Maximum depth
50 feet
Mean depth
23 feet
Public Park
No
Boat Ramp
No
Fish Present
NA
Volunteer monitoring began at Retreat Lake in 1996 and continued, with some gaps, through 2008 after which it was discontinued. The data indicated that Retreat Lake had the clearest water of all the monitored lakes and was low to moderate in primary productivity (oligotrophic - mesotrophic) with very good water quality, which appeared to be steady over time.
Profile data show thermal stratification was relatively stable through summer, and sedimentary phosphorus release added to deep water concentrations. Nitrogen to phosphorus ratios in the upper water were above 20:1, which favors other algal species over bluegreens.
Lake Retreat has no public access boat launch, but residents should watch aquatic plants growing nearshore to catch infestations of Eurasian milfoil or other noxious weeds.
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This bathymetric map shows contour lines of equal depth, similar to a topographic map would for mountains and valleys
This map shows the area of the watershed relative to the area of the lake. Generally speaking, the larger a watershed is relative to a lake, the greater the influence land use practices on lake water quality
Click image to enlarge
Back to top View or Download Data Use this tool to view or download data from the lake in tabular format. You can
define date ranges and select which parameters to view or download. Chart Data Use the charting tool to look at graphs showing single parameters for a single
water year at a time. Five year water quality trends
A common method of tracking water quality trends in lakes is by calculating
the “trophic state index” (TSI) (Carlson, 1977). TSI indicators predict the biological
productivity of the lake based on water clarity (Secchi) and concentrations of total
phosphorus (TP) and chlorophyll a (Chlor).
The average of these three TSI indicators during the growing season can be used
to place lakes in one of three broad categories:
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